Plunger lifter



F. IvI. IosL'IN.

PLUNGER LIFTER.

APPLICATION FILED MAR. 29, 1920.

l) IIIIIIIIIIII Patented May 2, 1922.

2 SHEETS-SHEET 2,

rtates in a directionto `hereinafter described andillustrated in thev accompanying drawings, in wvhiclif- Y ment.lv The spring also acts asga cushioning Vmeans for the plunger as igt rapproaches 'the TRANI: M. JOsniN, or AMSTERDAM, NEW YoRK,"AssiGNoa To STAT i PA''EAQViV FFICE.

NMAN MANUFAC- TUiarNG COMPANY, INC., or AMSTERDAM, NEW YORK, A CORPORATION or Nnw YORK.

Specification Oi" Application ined March as,

To all whom t may concern.

Be Ait known that I, FRANK M. JosLiN, a citizenof the United States, and residing at Amsterdam, Montgomery County, State of New. York, haveinvented certain new and useful improvements in Plunger Lifters, of which the following is a specification.

This invention relates particularly to mechanism` employed for operating v the plunger ofv a `bor makingmachine and its primary. object is to provide meansvvvhich are vplaced under tension as the plunger de'- scends,and which operatesv to assist in the return movement Of the plunger. specifically it""c. cv nsists`r in arranging a coiled spring about a shaft which iS- alternatelyrotated inoppositedirections to raise and lower the` lungenthev spring being secured at one yend tok the shaft andatthe other `end to a part held-infixedposition, so thatgas the shaft rolowfer `the plunger, vthe spring isputunder tensionA tvliichserves to; direction `and to vlift the plunger after the samfevjreaches the, lowerllimit of its move."

end ofzitsfdoivnward movement.

@Vith these andotherobieets in vieiv the Y invention-is embodied inggthe mec'zhanisin Fig. g1 shows aside elevation of va mechanism to which the invention is adapted to be applied, certain parts being vshown in sec-V tion;

Fig. 2 shows a front elevation of that portion of themachine to which the present invention is applied; v

Fig. 3 is a sectional view on-the line 3-3 of Figure 4, this View illustrating the manner ofY attaching the tensioning devices to the plunger operating shaft;

Fig. 4 is a sectional view on of Figure 2.

Referring to the parts of the mechanism in detail 10 represents the plunger of a boxj making machine, Which is adapted to enter a die 11 forthe purpose of shaping the material to form a box. The plunger 10 is supF ported from a crosshead 12 to which are secured suitable rack bars 13, these rack bars passing through suitable guidesi14 rigidly secured to ashxedpart of the machine frame. The plunger is caused to reciprocate by the the line r-d .tei-.ters raient.

yspring 23 under the desired tension.

Primeur. Lir'r'nn..

i920. serial No. 369,4se.

action of a shaft 15, provided with gears 1,6,A which mesh With the rack bars 13 above referred to. The shaft 15 is caused to rotate in opposite directions by means of the reciprocating rack bar 17, the teeth of which mesh with a! gear 18 secured to the shaft 15, said rack bar beingheld in engagement with the gear bymeans of a suitable' guidevvay 19. The rack bar 17 is given a reciprocating motion from a crank plate 20 mounted kon a shaft 21, Which is driven in any suitable manner.` v

The particular. `mechanism constituting the vsubj ect .-.matter of the present invention comprises a sleeve 22, ,which iskeyed to .the shaft 1 5.

ably secured to the sleeve 22, Vas by a sety screvv 24, a sleeve-25 being inter-posed be#v hoidingfthe sleeve 2?.V in

fixed position, suchmeans comprising a cast-j frame; This casting 'is pro-l `vided-With rib 28;,inwhicha rectangular `recess vis provided. p yrectangular portion vviiichis adapted to 'iitv the rectanaular. 'recessuinfthe 'ribj28 of- -The sleeve26 carries -a engagement; of said parts said casting, the v Y preventing rotation. ofV kthe sleevef26. The. sleeve26 lis further provided `with a flange portion 30 having openings o n its periphery which are intended for the reception of a suitable tool used in placing the coiled The parts of the mechanism just described are suitably housed in a cover 32 secured to the framework of the machine.

To brieiiy describe the operation of the l device, it will be understood that as the shaft 15 is caused to rotate in opposite direc-v tions through the action of the rack bar 17, the plunger l10 Will be caused to enter and recede from the die 11. Since the coiled spring 23- is fixed at one end to the sleeve 24 which rotates with end of the spring is secured in fixed position, the rotation of the shaft in opposite di? rections will alternately produce increased and decreased tension in said spring. The result is that When the shaft moves in a direction to forcejthe plunger 10Y into the die Patented May a, 1922.

.70 fcoiled spring 23 surrounds the shaft \15', onepend of this spring beii'ig'suitsecuredto this last 'mentionedsleeve.v Means are prend-ed for 27 fadjustably 'mountedupon a fixed part of the machine the shaft, and the other Y '11, the spring is placed under increased tenfor the plunger as it reaches the lower limit of its movement.

-While the invention has been described with specinc reference to a box making machine, it is by'no means limited to use in that particular connection, but is capable 0f employment in yvarious relations. It' is Anot to be understood, therefore, that the invention isfinte'nded to be restricted to the partic-` ular use referred to, nor t0 the particular details of mechanism which latter may obviouslybe modified without the spirit of the invention.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

l.' In a device of the kind described a Shaft, means for rotating thesame inoppositeV directions, a reciprocating plunger,

T means for causing reciprocation of said plunger as said shaftis rotated in opposite directions, aV sleeve nonretatably secured to said shaft, a coiled spring surrounding said shaft'and securedat' one end to said sleeve, a

` vthe tension of a'ndmeans for fsecondv'sleeve to which the other end of said spring-1s secured, said second sleeve being rotatably mounted' on said shaft, whereby saidf4 spring mayl be altered,

2.`In a device of `the kind descril'ied,VV a shaft vand a framev fork supporting'the same, means forl rotating lthe shaft f opposite directions, a reciprocating plunger, means for* vcausing reciprocation of said plunger as said shaft is'rotated in` opposite directions, a sleeve secu'redto said shaft, 4a coiled spring surrounding said shaft and secured vat one end! to said sleeve, Aai second sleeve to which departing from holding said second sleeve in Y fixedposition as said shaft is rotated in op'- -posite y directions.v

the other-end of said spring is secured, said second sleeve being loosely mounted on said shaft, a projection On 'said' secondfsleeve'," a

member rigidly secured to the machine and provided with a recess for receivingfthe pro- AJectlon on said second sleeve, whereby rotation ofsaid second sleeve is prevented. I 3. In a device of the kind described, a'A

shaftfand a frame' for supporting the same, means for rotating the shaft inopposite directions, a plunger, ay pair of' rack bars seed on `said-shaft to which the other endof said coiled spring is-sejcure'd, andcooper'at ing means on said second member and the frame'of the machine for preventing rota` tion-of saidsecond member assaid-'shaft is rotated in opposite directions;

fina device oftheflrindf described,favV f.

shaft and alframe for supporting? the same,` lmeans for rotating the shaft in-oppsite diff a reciprocating." Lpluiiger, S-m'e'ansf for causingreciprocation of said plunger lasE rections,

' said shaft is rotated in opposite directions-,Qa member nonrctatably secured'to saidfsh-aft;vr ,a coiled spring.supportingfsaid shaft and se-'- cured at oneend V't said-member, a 'seconds spring is secured, Vsaid secon'dfy'member' being?v rotatably mounted on said shaft lwherebyithe tension of said sp'ring'ma'yv bef varied, an adjustable device secured `to said'v frame; rvcooperating'means onsaid secondmeinber andjsaid device for preventing rotation of )said second member as said s haft vis 4rotated in oppositedirections;V i c c i In testimony whereof Ia'fiix mysignature,

g- FRANK M. JosLiN.V Y'

pinionsl nonrota'tablyvv between 'said rack bars, "a" 

